I changed the scenariopackets.h entry for MAX_ALLOWED_SCENARIO_POI_QUERY_SIZE from 42 to 84, to see if that would help.
Now the worldserver.exe runs without crashing. Hopefully this change has no bad side effect later.
Loading scenarios
>> Loaded 194 instance scenario entries in 2 ms
Loading scenario poi data
>> Loaded 0 scenario POI definitions. DB table `scenario_poi` is empty.
World initialized in 5 minutes 13 seconds
TC>TrinityCore rev. 0d6320dfd393 2019-08-08 09:06:16 +0200 (master branch) (Win6
4, RelWithDebInfo, Static) (worldserver-daemon) ready...